Large-scale, sub-tropical cloud activity near Titan's 1995 equinox

M. T. Lemmon, R. D. Lorenz, P. H. Smith, J. J. Caldwell

Research output: Contribution to journalArticlepeer-review

1 Scopus citations


We report observations of Titan using 190 images from the Hubble Space Telescope WFPC2 and NICMOS over 4 oppositions of Titan 1994–1997. Analysis of these images yields maps of surface brightness at 0.67, 0.94, and 1.08 μm that compare well with Cassini data, plus some transient features that are interpreted as large cloud systems. These systems indicate either two clouds covering 2 × 10 6 km 2 (~10% of Titan's observable disk and 2–3% of Titan's surface) in September 1995 or a repeat observation of a single cloud. The clouds are estimated to be upper-tropospheric, with tops between 27 and 39 km altitude. This pre-Cassini observation of prominent cloud activity near 30°N and 40°N shortly before equinox (L s = 177°) mirrors more recent Cassini observations and serves as an important constraint on the seasonal variation of convective activity with latitude on Titan.

Original languageEnglish (US)
Pages (from-to)1-14
Number of pages14
StatePublished - Oct 2019


  • Meteorology
  • Satellites, atmospheres
  • Titan, atmosphere
  • Titan, clouds

ASJC Scopus subject areas

  • Astronomy and Astrophysics
  • Space and Planetary Science


Dive into the research topics of 'Large-scale, sub-tropical cloud activity near Titan's 1995 equinox'. Together they form a unique fingerprint.

Cite this